Library /sys$common/syshlp/uafhelp.hlb ADD, Qualifiers, /MAXDETACH  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /MAXDETACH=value

    Specifies the maximum number of detached processes with the cited
    user name that can be active at one time. To prevent the user
    from creating detached processes, specify the keyword NONE. By
    default, a user has a value of 0, which represents an unlimited
    number.